JP3527135B2 - Water sealing device for underwater bearings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water seal device for a submersible bearing, and more particularly, to a submersible bearing used in a sand rake or a sludge rake in a treatment basin such as a sand basin or a sedimentation basin of a waste water treatment facility. The present invention relates to a suitable water sealing device.

[0002]

2. Description of the Related Art For example, in a settler and a sludge scraper used in a settling basin of a wastewater treatment facility, an endless chain wound around a sprocket provided in water is driven to circulate. Has become.

FIG. 4 is a sectional view showing the structure of a conventional underwater bearing which rotatably supports the sprocket as described above. In the drawing, a cylindrical bearing 2 is fitted and fixed to the inner circumference of a cylindrical housing H which is a boss portion of a sprocket 1 around which an endless chain (not shown) is wound.

A sleeve 4 is press-fitted onto the outer peripheral surface of a substantially horizontally extending shaft (fixed shaft) 3 which rotatably supports the sprocket 1, and a housing H is rotatable on the sleeve 4 via a bearing 2. Is pivotally supported by the housing H
Oil seals 5 and 5 are fixed to both ends of the shaft in the axial direction so as to prevent infiltration of dirty water into the gap between the bearing 2 and the shaft 3. Further, the housing H has its mounting position in the axial direction with respect to the shaft 3 determined by a pair of collars 7 and 7 which are fixed to the shaft 3 by bolts 6 on both sides of the housing H, respectively.

An oil sump 8 of lubricating oil is formed in a cylindrical shape around the sleeve 4 on the inner peripheral surface of the bearing 2, and the oil sump 8 is formed.
Is communicated with one end of an oil supply groove 10 formed in the shaft 3 and extending in the axial direction through a hole 9 formed in the sleeve 4. Further, one of the collars 7 is provided with an oil injection port 11 which is a screw hole into which a tip of a lubricating oil supply pipe leading to a pump (not shown) is screwed, and an oil injection path 12 which leads from the injection port 11 to the tip. The injection tool 13 is screwed, and the tip of the oil injection tool 13 is pressed against the hole 14 formed in the sleeve 4 so as to communicate with the other end of the oil supply groove 10. It communicates with the oil supply groove 10 in a water-sealed state.

At the end of the shaft 3, a support member 15 is provided with a bolt 16
The support 15 is fixed to the wall 18 of the processing pond via the fixture 17 so that the end of the shaft 3 is fixed. Reference numeral 19 is a mortar for installation and adjustment.

In the above structure, new high-pressure lubricating oil is pumped by a pump (not shown) from the oil and fat injection port 11 of the oil injection device 13 through the distribution valve having the check valve to the oil injection passage 12 and the hole 14. It is intermittently and forcibly injected into the oil sump 8 of the bearing 2 through the groove 10 and the hole 9, whereby the lip portions (sealing portions) of the oil seals 5 and 5 are opened by being pressed by the oil pressure, and the waste oil is discharged. The old oil is discharged into the processing pond and the lubricating oil is renewed.

[0008]

Such a conventional submersible bearing is characterized by a simple structure and low cost, but fine sand or sludge becomes turbid in the wastewater of the treatment pond. Since the submerged bearings are mixed and used in a severe environment of low speed and high torque, even if a known water sealing device is used, sewage will surely eventually pass through the oil seals 5 and 5 through the bearings 2. There is a problem that the bearing 2 and the sleeve 4 and the like are worn out at an early stage by invading the gap between the shaft 3 and the shaft 3 and staying there, causing deterioration of the lubricating oil and the like.

In general, of the sealing means arranged at the boundary with the dirty water, the fixed portion sealing means arranged at the fixed portion can prevent the dirty water from entering, but the shaft 3 and the bearing 2
The oil film of an extremely thin layer is always formed on the sealing surface of the moving part sealing means such as the oil seals 5 and 5 arranged in the relative rotation part such as between the shaft 3 and the shaft 3. When the outer peripheral surface and the sealing surface of the moving portion sealing means are enlarged and seen, it can be seen that there are irregularities. In particular, since the shaft 3 is cut by sending it to a cutting tool at the time of production, a myriad of screw-shaped concave and convex grooves are formed on the outer peripheral surface of the shaft 3 to prevent sewage in the concave groove. The lubricating oil will be mixed and trapped.

The dirty water and the lubricating oil trapped in the concave groove are entrained by the viscosity of the oil when the shaft 3 rotates, but the concave groove functions as a screw pump. Then, although extremely small, the lubricating oil may flow out into the dirty water, or the dirty water may enter the inside of the bearing 2, and the infiltrated dirty water may remain inside the bearing 2 to deteriorate the lubricating oil. If deterioration progresses earlier, the lubricating oil may solidify, and it is not possible to completely inject new oil and push out used oil for renewal.

It is a matter of course that when the sealing means begins to wear, the amount of dirty water that enters the bearing 2 increases.

In view of the above-mentioned circumstances, the present invention reliably seals the gap between the shaft and the bearing without letting infiltrate into the gap between the shaft and the bearing even under a harsh environment, thereby achieving good lubrication. It is an object of the present invention to provide a water seal device capable of maintaining stable performance of a submersible bearing for a long period of time by maintaining the state.

[0013]

SUMMARY OF THE INVENTION The present invention is a housing containing a bearing for pivotally mounting a shaft extending substantially horizontally, and a first seal disposed in the housing adjacent to the axial end of the bearing. And a water reservoir provided adjacent to the first sealing means at an axial end portion of the housing.

The inside of this water storage chamber is filled with oil in advance, and the lowest part of the water storage chamber is at least lower than the lowest position of the sealing surface of the first sealing means. .

A second sealing means is interposed between the shaft and the end wall of the water storage chamber opposite to the first sealing means, and the vicinity of the lowest portion of the water storage chamber. Is provided with a discharge path for communicating with the outside.

At the lowest part of the water storage chamber, even if a small amount of water that has entered through the second sealing means, which is the moving means sealing means, collects at the bottom of the water storage chamber, the water surface thereof is the first sealing means. It is set to a low level where there is no danger of reaching the lowest position on the sealing surface of.

[0017] In addition, oil press-fitting the oil into the room sump the water
A press-fitting means is provided, and the water storage chamber is
If water enters this water reservoir,
Oil that is press-fitted into the water storage chamber from the
The water that has deteriorated due to the mixing of water and oil and the water
Enough volume to separate and form layers due to weight differences
I have it. Along with the operation of the hydraulic guide means, the upper
Oil that has deteriorated due to mixing of water and oil in the water storage chamber,
Water accumulated in the bottom of the water reservoir chamber, the chamber sump the water
It is configured to be pushed by the oil that has been press-fitted and to be discharged to the outside through the discharge passage.

The oil may be press-fitted into the water storage chamber by providing a means for directly press-fitting the oil into the water storage chamber. However, new oil is press-fitted into the gap between the shaft and the bearing. Therefore, it is preferable that the old oil in the gap is press-fitted into the water reservoir chamber through the seal portion of the first sealing means.

In the water sealing device according to the present invention, the shaft side is fixed and the housing is rotatably supported by the fixed shaft via a bearing. On the contrary, the housing side is fixed. The present invention can be applied to both the bearing of the housing and the underwater bearing having a structure in which the shaft is rotatably supported.

It is preferable that the water storage chamber has a volume and a shape sufficient to maintain an almost stationary oil layer of the oil filled in the water storage chamber when the water storage chamber rotates together with the housing. .

[0021]

According to the present invention, the water storage chamber, which is sealed from the shaft by the second sealing means, is attached to the axial end of the housing.
The second sealing means, the water storage chamber, and the first sealing means are interposed in series between the dirty water and the bearing. In this case, since the second sealing means arranged at the boundary between water and oil is the moving section sealing means like the first sealing means, a small amount of dirty water is collected through the second sealing means. Although it will invade the room, oil has already been filled in the water storage chamber, so the water that has entered the water storage chamber will flow along the inner wall surface of the water storage chamber due to the difference in specific gravity between the oil and water. It moves downward and completely separates from the oil in the upper layer and collects at the bottom of the water storage chamber.

The lowest part of the water reservoir is at least the sealing surface of the first sealing means so that the surface of the sewage collected at the bottom of the water reservoir does not reach the lowest position of the sealing surface of the first sealing means. Since the first sealing means is always located at the boundary between oil and oil because it is lower than the lowest position of the above, there is a possibility that dirty water may enter the gap between the shaft and the bearing through the first sealing means. Disappears.

Therefore, the oil injected into the bearing can maintain its lubricity very well, and the shaft and the bearing can have a long service life.

Since a discharge pipe is provided which communicates the vicinity of the lowest part of the water storage chamber with the outside, the oil in the water storage chamber is forced into the water storage chamber by pressing oil into the water storage chamber.
And the oil advances the oil mixed deteriorated, and a sewage accumulated in the bottom of the water reservoir chamber, thereby leading the wastewater can be pushed to the outside through the discharge passage.

With the intermittent pumping supply of new oil to the gap between the shaft and the bearing, the old oil in the gap opens the seal portion of the first sealing means by the pressure and enters the water reservoir chamber. Since it is pushed out, the waste water collected at the bottom of the water storage chamber can be discharged to the outside through the discharge passage.

Further, the shaft is fixed, and the water storage chamber is
When configured to rotate with the housing, the oil in the sump chamber adheres to the inner wall surface of the sump chamber to form a thin oil film layer and is entrained by the inner wall of the sump chamber. Therefore, if the width of the water storage chamber in the axial direction is narrow, the entire oil in the water storage chamber will be entrained by the inner wall of the water storage chamber, and the action of separating it from the waste water will decrease. Therefore, when the water storage chamber rotates together with the housing, the water storage chamber has a volume and shape sufficient to maintain an almost stationary oil layer of the oil filled in the water storage chamber. And water can be reliably separated.

Further, when the oil in the water storage chamber is swept along the inner wall of the water storage chamber, it becomes turbid due to contact with the dirty water that has entered the water storage chamber, causing early deterioration, but even in that case, the turbidity Since the specific gravity of the oil is larger than that of non-turbid oil, if the volume of the water storage chamber is large enough, the upper layer inside the water storage chamber is a waste oil that has just been extruded from the bearing and has relatively little deterioration, and an intermediate layer. Will be separated into three kinds of liquid, turbid and deteriorated waste oil, and lower layer wastewater, even if the waste oil is pushed out of the discharge passage,
Since the deteriorated waste oil is discharged first, the deteriorated waste oil does not become stagnant in the water storage chamber, and the lubricating oil in the bearing can be renewed very appropriately.

Conventionally, sliding bearings have generally been used for submersible bearings. However, the addition of the water seal device of the present invention makes it possible to maintain a long life even if rolling bearings are used. . This is due to the fact that rolling machinery is used in machines equipped with a large number of bearings, such as sand settler and sludge attractor that operate by dragging heavy chains and scrapers. Since the resistance can be made extremely small, there is an additional effect that the driving power can be significantly reduced and energy saving can be achieved.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a first embodiment of a submersible bearing according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

The underwater bearing of this embodiment is used for the same purpose as the conventional underwater bearing shown in FIG. 4, and since the underwater bearing itself has the same structure, it is common to the underwater bearing of FIG. The same reference numerals are given to the members to be shown.

Also in this submersible bearing, the bearing 2 is fitted and fixed to the inner circumference of the cylindrical housing H which is the boss of the sprocket (driven sprocket) 1 around which an endless chain (not shown) is wound, and the housing H is rotated. A sleeve 4 is press-fitted onto an outer peripheral surface of a substantially horizontally extending shaft (fixed shaft) 3 which is freely supported, and a housing H is rotatably supported on the sleeve 4 via a bearing 2, and a housing H is further provided. Oil seals (first sealing means) 5 and 5 which are moving section sealing means for preventing invasion of dirty water into the gap between the shaft 3 and the bearing 2 are supported by the seal holder 23 at both ends of the seal holder 23. The bearing 2 is mounted in contact with both ends thereof.

On the outer peripheral surfaces of both ends of the housing H, there are cup-shaped members 20 each having an axial hole through which the sleeve 4 passes.
The cup-shaped members 20 are coaxially fitted to each other via a fixed portion sealing means composed of an O-ring 21.
On the inner peripheral surface of the wall portion 20a which is in sliding contact with the outer peripheral surface of the sleeve 4, a moving portion sealing means including an O-ring 22 (second sealing means) is provided. Then, the outer surface of the housing H, the oil seal 5 (moving part sealing means), the O-ring 21 (fixed part sealing means), the outer peripheral surface of the sleeve 4, the inner peripheral surface of the cup-shaped member 20, and the O-ring 22 (second). The space isolated from the outside is formed as the water storage chamber 24 by the sealing means (1). In this case, the lowest portion (shown by reference numeral B) of the water storage chamber 24 is located at the lowest position (shown by reference numeral a in FIG. 1) of the seal surface of the moving portion sealing means 5, 22. The size of the water storage chamber 24 is set to be low.

Even if a small amount of water that has entered through the O-ring 22 (second sealing means), which is a moving means sealing means, accumulates at the bottom of the water storing room (24), The water surface is set to a low level at which there is no possibility of reaching the lowest position (a) of the sealing surface of the oil seal 5 (first sealing means), which is at least the moving part sealing means.

A collar 7 for deciding a mounting position of the sprocket 1 on the shaft 3 is disposed on the outer side of each cup-shaped member 20 in the axial direction.
It is fixed on the sleeve 4 by a bolt 6 with a slight gap 45 between the end surface of the sleeve 4 and the end surface of the sleeve 4.

An oil reservoir 8 of lubricating oil is formed in a cylindrical shape on the inner peripheral surface of the bearing 2 as in the conventional structure shown in FIG.
The oil sump 8 communicates with an oil supply groove 10 formed in the shaft 3 and extending in the axial direction through a hole 9 formed in the sleeve 4. Further, one of the collars 7 is provided with an oil injection port 11 which is a screw hole into which a tip of an oil supply pipe leading to a pump (not shown) is screwed, and an oil injection path 12 which leads from the oil injection port 11 to the tip. Since the injection tool 13 is screwed and the tip of the oil injection tool 13 is pressed against the hole 14 formed in the sleeve 4 so as to communicate with the oil supply groove 10, the oil injection path 12 and the oil supply groove are formed. While communicating with 10, it prevents the infiltration of dirty water into the oil supply system.

At the bottom of the water storage chamber 24, the water storage chamber 2
Vertically extending discharge pipe 2 that connects 4 to the sewage treatment pond
5 is attached. The upper end of the discharge pipe 25 is
The groove 26 formed in the lowest part of the shaft 3 extends in the axial direction through a hole formed in the sleeve 4, and the upper end of the hole 27 of the discharge pipe 25 is in contact with the groove 26. Since the notch 28 facing the groove 26 is formed on the outer periphery of the upper end portion of the groove 25, the hole 27 of the discharge pipe 25 is formed in the groove 2
It communicates with 6. The lower end of the hole 27 of the discharge pipe 25 is shown in FIG.
The opening is made at a position slightly higher than the lowest part of the water storage chamber 24 indicated by the symbol B.

The discharge path 2 is provided at the lowest part of each collar 7.
The discharge tool 30 provided with 9 is screwed, and the upper end of the discharge tool 30 is pressed against the hole formed in the sleeve 4 via the sealing means 31, so that the discharge path 29 and the groove 26 of the shaft 3 are not wet. It communicates in a sealed state. At the lower end of the discharge path 29, the discharge path 29
A screw hole 32 is formed in which the tip of a pipe (not shown) that extends above the water surface is screwed. In this case, the discharge pipe 2
It is preferable that the lower end of the discharge tool 30 is lower than the lower end of 5.

In the submersible bearing having the above-described structure, high-pressure lubricating oil is press-fitted from the oil inlet 11 prior to the start of use, and this oil first enters the oil sump 8 and then the oil seal 5 , 5 are pressed and opened to fill the water storage chambers 24, 24. In this case, it is preferable that each cup-shaped member 20 be provided with an air vent hole (not shown) into which a blocking plug can be screwed.

A part of the oil filled in the water storage chamber 24 is
When the cup-shaped member 20 is rotated together with the housing H, it adheres to the inner wall of the water storage chamber 24 due to the viscosity of the oil and forms a thin oil film layer to be entrained, so that the water is filled in the water storage chamber 24. The size of the cup-shaped member 20 in the axial direction is increased so that the entire oil is not entrained, so that the volume of the entire water storage chamber 24 is sufficiently larger than the volume occupied by the thin oil film layer. Is set to.

By filling the water in the water storage chamber 24 with the oil, the oil seals 5 and 5 serving as one of the moving portion sealing means allow the boundary between the oil in the bearing 4 and the oil in the water storage chamber 24. O, which is interposed between the two parts and is the other moving part sealing means.
The rings 22 and 22 are arranged at the boundary between the oil in the water storage chamber 24 and the wastewater in the wastewater treatment pond.

Next, the state of oil and sewage when sewage enters the water storage chamber 24 will be described with reference to FIG.

The slight amount of water that has entered the water storage chamber 24 through the sealing surface of the O-ring 22 moves downward along the inner wall surface of the water storage chamber 24 due to the difference in specific gravity between oil and water, and the upper layer It completely separates from the oil and accumulates at the bottom of the water reservoir.

When the sprocket 1 is stationary, the water surface of the sewage when completely separated from the oil 36 is indicated by reference numeral 3.
5, the cup-shaped member 20 is rotated in the direction of the arrow in accordance with the rotation of the sprocket 1, for example, and the sewage surface is rotated to the position indicated by the reference numeral 35 'due to the viscosity of the oil. When the sewage surface inclines in this way to some extent, the sewage water balances with the gravity of the sewage water and the viscosity of the thin oil film layer rotated along the inner peripheral surface of the cup-shaped member 20, and the sewage surface cannot further incline. At that time, at the lower end portion of the inner peripheral surface of the cup-shaped member 20, the thin oil film layer rotated along with the inner peripheral surface sneaks into the lower surface of the dirty water as a thinner oil film 38. The inclination of the sewage surface changes depending on the peripheral speed of the cup-shaped member 20 and the viscosity of the oil, but as in the present embodiment, the submerged bearing used in the sand rake or sludge rake has a high It is a bearing that operates at a relatively low speed under torque and has a large shaft diameter, so without increasing the size of each component of the conventional underwater bearing,
The volume of the water storage chamber 24 can be easily secured, and high-viscosity oil can be used.

In the state shown in FIG. 2 in which sewage has entered the water storage chamber 24 (the sewage surface 35 is higher than the actual one for the sake of explanation), a distribution valve provided with a check valve is provided by a pump (not shown). When high-pressure lubricating oil is intermittently injected into the bearing 2 through the oil injection port 11 through the, the lip portions of the oil seals 5 and 5 which are the moving portion sealing means are pushed by the pressure of the old oil in the bearing 2. Open, the old oil becomes waste oil and the sump chamber 24
The sewage is pushed out of the water, and the separated sewage is pushed out of the discharge pipe 25 and is intermittently discharged from the water storage chamber 24. That is, the sewage that has entered the water storage chamber 24 is pushed out with the oil one after another, and is discharged before reaching the lowest portion of the seal surfaces of the oil seals 5 and 5 indicated by the symbol a. By this, it is possible to completely prevent the infiltration of dirty water into the gap between the shaft 3 and the bearing 2.

The oil in the water storage chamber 24 is
When it is routed to the inner wall of the water, it becomes turbid due to contact with the dirty water that has entered the water storage chamber 24, and deteriorates early,
Even in that case, since this turbid oil has a larger specific gravity than the non-turbid oil, if the volume of the water storage chamber 24 is sufficiently large, the upper layer is a waste oil that has just been extruded from within the bearing 2 and has relatively little deterioration. However, the turbid and deteriorated waste oil in the middle layer will be separated into the wastewater and three kinds of liquid in the lower layer, and even if the waste oil is pushed out from the discharge passage, the deteriorated waste oil Since the oil is discharged first, the deteriorated waste oil will not be stagnated in the water storage chamber 24, and the lubricating oil in the bearing will be renewed very appropriately.

FIG. 3 is a sectional view showing a second embodiment of the underwater bearing according to the present invention. In the above-described first embodiment, the sprocket having the bearing is rotatably supported on the fixed shaft, whereas in the present embodiment, the shaft to which the sprocket (drive sprocket) is fixed has the bearing. It is rotatably pivoted in a fixed housing, which simplifies the construction. Since the structure of the main part is common, in FIG. 3, members corresponding to those in FIG. 1 are denoted by the same reference numerals.

That is, a shaft (rotating shaft) extending substantially horizontally
A sleeve 4 is press-fitted to the outer peripheral surface of the cylindrical housing 3, and a bearing 2 is fitted and fixed to the inner peripheral surface of the cylindrical housing H to rotatably support the shaft 3 via the sleeve 4. At one end of the housing H, an oil seal (first sealing means) that is a moving portion sealing means for preventing infiltration of dirty water into the bearing portion.
5 is supported by the seal retainer 23 and is attached in contact with one end of the bearing 2.

On the outer peripheral surface of one end of the housing H, a cup-shaped member 20 having an axial hole through which the sleeve 4 penetrates is formed.
An O-ring (second sealing means) is provided on the inner peripheral surface of the cup-shaped member 20 that is coaxially fitted through the fixed portion sealing means including the ring 21 and is in sliding contact with the outer peripheral surface of the sleeve 4.
A moving part sealing means consisting of 22 is provided. Then, the outer surface of the housing H, the oil seal 5 (moving part sealing means), the O-ring 21 (fixed part sealing means), the outer peripheral surface of the sleeve 4, the inner peripheral surface of the cup-shaped member 20, and O.
A space that is isolated from the outside is formed as a water storage chamber 24 by the ring 22 (moving part sealing means). Also in this case, the lowest part of the inner peripheral surface of the cup-shaped member 20 shown by the reference symbol B is lower than the lowest position of the moving part sealing means 5, 22 shown by the reference symbol a in FIG. In addition, the size of the inner peripheral surface of the cup-shaped member 20 is set.

A collar 7 for preventing the shaft 3 from moving to the right is disposed on the axially outer side of the cup-shaped member 20 (on the left side in FIG. 3).
It is fixed on the sleeve 4 by a bolt 6 with a slight gap 25 between the end surface of the sleeve 4 and the end surface of the sleeve. A cover member 40 is fixed to the end surface of the housing H on the tip side of the shaft 3 by a bolt (not shown), and an O-ring 41 as a sealing means is interposed between the cover member 40 and the housing H. The other end of the housing H is water-sealed.

On the inner peripheral surface of the bearing 2, an oil sump 8 of lubricating oil is provided.
Is formed in a cylindrical shape. In the present embodiment,
An oil injection port 11 into which a tip of an oil supply pipe leading to a pump (not shown) is screwed is formed in an upper portion of the oil sump 8 of the housing H, and the oil injection port 11 is formed in the housing H. Also, it communicates with the oil sump 8 through a hole 43 formed in the bearing 2.

A discharge pipe 25, which serves as a discharge passage for connecting the water storage chamber 24 to the wastewater treatment pond, is vertically provided on the bottom wall of the cup-shaped member 20 so as to penetrate the bottom wall. The upper end of the discharge pipe 25 opens at a position slightly higher than the lowest portion of the water storage chamber 24, which is indicated by the symbol B in FIG.

In the present embodiment, since the discharge pipe 25 is vertically provided on the bottom wall of the cup-shaped member 20, oil passes from the oil inlet 11 through the oil sump 8 in the atmosphere prior to the start of use. When the water is stored in the water storage chamber 24, the oil may leak from the discharge pipe 25 due to its own weight. In order to prevent the oil from leaking, a small hole 27a is formed at the upper end of the hole 27 of the discharge pipe 25 so as to give the oil an outflow resistance.

In the present embodiment, the drain pipe 25 is vertically provided on the bottom wall of the cup-shaped member 20, but instead of the drain pipe 25, the water storage chamber is simply provided on the bottom wall of the cup-shaped member 20. It is also possible to simply form a hole for communicating 24 with the treatment pond.

Further, in the present embodiment, since only the shaft having the sleeve 4 rotates, the oil entrainment occurs only on the outer peripheral surface of the sleeve 4 , so that the oil enters the water reservoir chamber 24 and the oil The sewage collected in the lower layer does not form an inclined sewage surface 35 'as shown in FIG. 2, but becomes the same as the horizontal sewage surface 35 when stationary.

As is clear from the above description of the first and second embodiments, the present invention provides the second sealing means (O-ring 22) which is the moving portion sealing means that makes a boundary with sewage. The sewage that surely enters from the seal part is completely separated into the lower layer side of the oil in the water storage chamber 24 due to the difference in the specific gravity of the oil and the water, and the lower position of the lower layer, which becomes the sewage layer, is drained by the discharge channel. Communicating with the outside of the reservoir chamber 24,
By further press-fitting the oil into the water reservoir chamber 24 filled with oil, the hydraulic pressure causes the wastewater to be discharged to the outside of the water reservoir chamber 24 through the discharge passage so that the infiltrated wastewater does not reach the bearing portion. is there.

The drain end of the discharge passage does not necessarily have to be provided at a position lower than the bottom of the sealing surface of the second sealing means (O-ring 22). When installing at a position higher than the lowest part of the sealing surface of the sealing means, make the hole of this discharge path small and block this hole with the adhesion of oil to prevent the infiltration of dirty water from the inside of the discharge path. Even if the waste water and the oil are mixedly discharged, the waste water and the oil are discharged in the form of a plug.

Therefore, in FIG. 1, the drain passage extending from the screw hole 32 to the surface of the pipe (not shown) is also preferably formed as a small hole, and the state of the oil drained at the drain end is monitored. The situation inside the bearing can be diagnosed.

Further, in the above-mentioned embodiment, the bearing is a sliding bearing like the conventional underwater bearing, but if the water sealing device according to the present invention is used, the bearing is the same as the bearing provided in the atmosphere. Those skilled in the art can easily understand that a rolling bearing such as a ball bearing may be used because it can be used under certain conditions.

Further, in the above-described embodiment, the new oil is press-fitted into the gap between the shaft 3 and the bearing 2 so that the old oil in the gap is press-fitted into the water reservoir chamber 24, so that the water reservoir chamber 24 Although the sewage in the inside is discharged together with the oil, the present invention is not limited to this, and a separate hydraulic pressure injection means for directly injecting the oil into the water reservoir chamber 24 may be provided.

Further, the sleeve 4 is omitted, or instead of the groove 26 of FIG. 1, a long hole reaching the shaft end is opened in the central portion of the shaft 3, and a long hole is plugged into the hole 27 and the discharge passage 29. The communication may be established.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a submersible bearing according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a second embodiment of a submersible bearing according to the present invention.

FIG. 4 is a sectional view of a conventional submersible bearing.

[Explanation of symbols]

H housing 1 sprocket 2 bearings 3 axes 4 sleeve 5 Oil seal (first sealing means) 7 colors 8 oil sump 20 cup-shaped member 22 O-ring (second sealing means) 24 water reservoir 25 discharge pipe

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Claims (5)

(57) [Claims] 1. A housing (H) containing a bearing (2) pivotally mounted on a shaft (3) extending substantially horizontally, and the housing (H) adjacent to an axial end of the bearing (2).
And a first sealing means (5) disposed in the submerged bearing, wherein oil is pre-filled inside and the lowest part (b) is at least the sealing surface of the first sealing means (5). A water reservoir chamber (24) attached to the end of the housing (H) in the axial direction so as to be lower than the lowest position (a), adjacent to the first sealing means (5); Second sealing means (22) interposed between an end wall (20a) of the chamber (24) opposite to the first sealing means (5) side and the shaft (3); The water storage chamber (24) is provided with a discharge passage (27) for communicating the vicinity of the lowest part (b) with the outside and a hydraulic pressure injection means for pressurizing oil into the water storage chamber (24). 24) is the water by the hydraulic pressure input means
Oil press-fitted into the sump chamber (24) and the water sump chamber (2
4) Oil that has deteriorated due to mixing of water and oil that has entered the inside,
The water is separated into layers by the difference in specific gravity.
Has a sufficient volume for the inside of the water reservoir chamber (24) as the hydraulic pressure input means operates .
The oil that has deteriorated due to the mixing of water and oil and the water that has accumulated at the bottom of the water storage chamber (24) are the water storage chamber (24).
A water sealing device for a submersible bearing, wherein the water sealing device is configured to be pushed by the oil press-fitted therein and to be discharged to the outside through the discharge passage (27) . 2. The first hydraulic pressure means inserts new oil into the gap between the shaft (3) and the bearing (2) to press old oil in the gap to the first sealing means (5). 2. The water sealing device for a submersible bearing according to claim 1, further comprising means for press-fitting into the water reservoir chamber (24) through the seal portion. 3. The shaft (3) is fixed, the shaft (3)
The water seal device for a submersible bearing according to claim 1 or 2, wherein the housing (H) is rotatably supported via the bearing (2). 4. The water reservoir chamber (24) retains the oil filled in the water reservoir chamber (24) when the water reservoir chamber (24) rotates together with the housing (H). The water sealing device for a submersible bearing according to claim 3, wherein the water sealing device has a volume and a shape sufficient to maintain a substantially stationary oil layer. 5. The housing (H) is fixed, and the shaft (3) is rotatably supported by the bearing (2) of the housing (H). 2. A water seal device for a submersible bearing according to 2.